Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Narrative) (Details)

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SUBSEQUENT EVENTS (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended
Jul. 29, 2021
Aug. 03, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 20, 2020
Subsequent Event [Line Items]                  
Dividends on common stock (in dollars per share)     $ 0.28 $ 0.25 $ 0.25 $ 0.25 $ 0.53 $ 0.50  
Dividends on preferred stock (in dollars per share)     $ 171.88 $ 171.88          
Stock repurchase program, number of shares repurchased     1.1           3.7
Stock repurchase program, shares repurchased amount     $ 42.3            
Stock repurchase program, remaining authorized repurchase amount     $ 82.7       $ 82.7   $ 20.0
Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock dividend increase in amount per share $ 0.03                
Common stock dividend percentage of increase in amount per share 12.00%                
Dividends payable, date declared Jul. 29, 2021                
Stock repurchase program, number of shares repurchased   1.5              
Stock repurchase program, shares repurchased amount   $ 54.0              
Stock repurchase program, remaining authorized repurchase amount   $ 28.7              
Common Stock, Class A | Subsequent Event                  
Subsequent Event [Line Items]                  
Dividends on common stock (in dollars per share) $ 0.28                
Dividends payable, date to be paid Aug. 27, 2021                
Dividends payable, date of record Aug. 13, 2021                
Depositary Shares | Subsequent Event                  
Subsequent Event [Line Items]                  
Dividends on preferred stock (in dollars per share) $ 0.43                
Series A Preferred Stock                  
Subsequent Event [Line Items]                  
Number of preferred stock represented by each depositary share             The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock    
Series A Preferred Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Dividends on preferred stock (in dollars per share) $ 171.88                
Dividends payable, date to be paid Sep. 01, 2021                
Dividends payable, date of record Aug. 17, 2021